 /*******************************************************************************
  * Copyright (c) 2004, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.presentations;

 import org.eclipse.jface.action.Action;
 import org.eclipse.ui.internal.WorkbenchMessages;
 import org.eclipse.ui.presentations.IPresentablePart;
 import org.eclipse.ui.presentations.IStackPresentationSite;

 /**
  * This convenience class provides a "close" system menu item that closes
  * the currently selected pane in a presentation. Presentations can use
  * this to add a close item to their system menu.
  *
  * @since 3.0
  */
 public final class SystemMenuClose extends Action implements ISelfUpdatingAction {

     private IStackPresentationSite site;
     private IPresentablePart part;

     public SystemMenuClose(IStackPresentationSite site) {
         this.site = site;
         setText(WorkbenchMessages.PartPane_close);
     }

     public void dispose() {
         site = null;
     }

     public void run() {
         if (part != null) {
             site.close(new IPresentablePart[] { part });
         }
     }

     public void setTarget(IPresentablePart presentablePart) {
         this.part = presentablePart;
         setEnabled(presentablePart != null && site.isCloseable(presentablePart));
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.presentations.ISelfUpdatingAction#update()
      */
     public void update() {
         setTarget(site.getSelectedPart());
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.presentations.ISelfUpdatingAction#shouldBeVisible()
      */
     public boolean shouldBeVisible() {
         return true;
     }
 }

